I like this post and it's helpful for me because there are a few things I could think about a little more in my own training - maybe just one thing I can suggest be added for those who like me start off with such a poor defence they need to be told the obvious.

When you say move out of the danger zone straight back is not always the best way to do it. Sure it's good at times but if your opponent is hot on your heels or has a reach advantage you'll be a little safer using your angles. If your going straight back still in line with your opponents straights then you might end up moving back with your chin up off balance which opens up your guard more.

Sorry if this was in there and I missed it - just skim reading posts occasionally because I shouldn't procrastinate at uni quite as much as I do